CENTER OF GRAVITY

The center of gravity is the center of an object. It is a balance point of an object. For example, the center of gravity in a round object is the center of the object. Our center of gravity is normally behind our navel. Center of gravity is where the force of gravity appears to act. The force of gravity acts on all points in an object not only at the center of gravity. An object's center of mass is the same as its center of gravity. If a vertical line passes through an object's center of gravity, the object will be balanced. But if the center of gravity is moved to one side, the object will turn in that direction. For example, when you are riding a box car and lean to your left, the box car will also turn to the left.
somersault
The yellow X's in the picture represent the gymnast's center of gravity. The dashed line shows the curved path his center of gravity takes. Like the center of gravity of any projectile, his center of gravity traces a parabolic arc.

beam

This gymnast keeps her balance while performing difficult exercises by making sure her center of gravity stays directly above the beam.

When we drove boxcars around the track, we leaned into the curve so that our center of gravity shifted and our car continued to circle the track.
curve


by Lema, Jacqueline and Grant

Gravity
Friction
Bearings
Lubrication
Energy
Speed
Leverage
Center of
Gravity
Field Trip
Photos
Bibliography

Box Car Physics | Kapunahala